ENFORCE28153

• Permit No: C1980007
• IBM Index Class Name: Enforcement
• Doc Name: WEST ELK SMALL AREA EXEMPTION SAE LONE PINE GULCH DEVELPMENT WASTE PILE
• Violation No.: CV1995016
• Media Type: D
• Archive: No

R, • •
Watershed Discharge and Water Quality
Description Peak Discharge Peak Settleable Concentration
~ cubic feet per second (mlft)
(cfs) ~
watershed above the develop- 0.53`'- nas
ment waste pile interceptor
ditch
watersheds 1-1-1.1 and I-1-1-2, 0.29" na"
circumvential ditch DWP-W
0.17`.0 122.725.6
watersheds 1-2-1-1 and 1-2-1-2, 0.47" na"
circumventing ditch DWP-E
0.28s'` 136.39s.6
watershed 1-3-1-1 0.93" na`~
0.56s ° 170.15s °
vegetative debris filler ~
IN 1.02s° 153.04s `
OUT 0.99` ° O.OOs'
' 100-year, 24-hour storm event
= See Enclosure 3
s This value is not a SAE criteria parameter.
' See Enclosure 4
s See Enclosure 5
` 10-year, 24-hour storm event
Ditch Dep[h and Water Velocity
Description Depth (with Freeboard) Velocity
Interceptor Ditch, Development
Waste Pile 1.21 feet' 0.50 fps'
circumvential Ditch, DWP-W 0.70 feeP 3.69 fps2
circumvential Ditch, DWP-E 0.74 feet' 4.16 fps'
' Enclosure 6
= Enclosure 7
' Enclosure 8
8. PROPOSAL
Mountain Coal Company proposes to construct the development waste pile as described and to employ best
management practices to: 1) reduce sediment discharges oll the pile to concentrations less than effluent
s[andards, and 2) to protect the pile.
(West Elk SAE, [.one Pine Gulch Development wazte Pile, Pape 7 0(8)